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Passing Options

suggest change 
public bool Check()
{
    string input = "Hello World!";
    string pattern = @"H.ll. W.rld!";

    // true
    return Regex.IsMatch(input, pattern, RegexOptions.IgnoreCase | RegexOptions.Singleline);
}
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Regular expressions:
* Regular Expressions System.Text.RegularExpressions
* Check if pattern matches input
* Passing Options
* Match into groups
* Remove non alphanumeric characters from string
* Simple match and replace
* Find all matches
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